Average petrol and diesel prices have risen by 10p per litre so far this year, new figures show. The RAC said the average price of a litre of petrol increased by 3p to 150.0p in April alone. It claimed drivers are being “seriously overcharged for diesel”, with average prices rising by 2p per litre to 157.8p in April. Rising pump prices since the start of the year have added around £5.50 to the cost of filling a typical 55-litre family car. The RAC is calling on the Competition and Markets Authority (CMA) – an independent non-ministerial Government department – to address “glaring issues” with fuel retailing. It wants the regulator – which is responsible for monitoring prices and will oversee the incoming PumpWatch price transparency scheme – to tackle “unfair retailer margins which lead to drivers getting a raw deal”. The RAC said if the biggest fuel retailers charged “fairer margins” it would benefit drivers in several ways, such as: – Ending the “postcode lottery” which means some companies charge “wildly different prices” across locations. – Stop so-called rocket and feather pricing, where pump prices surge when wholesale costs rise, but fall slowly when wholesale costs decline. – Reduce fuel...